JP5707878B2 - Fluid ejecting apparatus and medical device - Google Patents

Description

  The present invention relates to a fluid ejecting apparatus and a medical device including the fluid ejecting apparatus.

A method of excising, incising, and crushing a living tissue using a fluid ejecting apparatus has excellent characteristics as a surgical tool, such as being free from thermal damage and capable of preserving tubule tissue such as blood vessels. Conventionally, for example, as described in Patent Document 1, an injection pipe that injects high-pressure fluid, a supply source that supplies fluid to the injection pipe, and a control unit that controls the pressure of the supplied fluid are provided. Fluid ejection devices were known.

Further, for example, as described in Patent Document 2, the fluid ejecting apparatus that rapidly changes the volume of the fluid chamber by the volume changing means, converts the fluid into a pulsating flow, and ejects the fluid from the ejection opening in a pulsed manner. Was known.

JP 63-99853 A JP 2008-82202 A

However, in Patent Document 1 described above, the pressure control unit for the fluid to be supplied is disposed away from the operator's hand as a liquid supply control device. Moreover, in patent document 2, the pressure generation part which supplies a fluid, and the control part of the volume change means which converts a fluid into a pulsating flow were proposed as a separate body from the pulsation generation part distribute | arranged to an operator's hand. . Therefore, when changing control conditions such as fluid pressure and pulsation intensity during surgery, an operator other than the operator is required, or the operator needs to interrupt the operation once and perform the operation. was there. On the other hand, it was considered to install a new controller at the operator's hand, but it was necessary to route a new signal line from the operator's hand to the control unit, so workability deteriorated. There was a problem. In addition, there is a problem that malfunction occurs when noise is placed on the routed signal line.

SUMMARY An advantage of some aspects of the invention is to solve at least a part of the problems described above, and the invention can be implemented as the following forms or application examples.

[Application Example 1] A fluid ejecting apparatus according to this application example includes a first fluid chamber, a pulsating flow generator having volume changing means for changing the volume of the first fluid chamber, and a first fluid chamber. And an adjusting unit that adjusts the amount of change in the volume of the injection channel that follows the change in volume of the first fluid chamber. It is arrange | positioned between the generation | occurrence | production part and the injection | emission opening part, It is characterized by the above-mentioned.

According to this application example, at the moment when the volume of the first fluid chamber changes in the decreasing direction, the fluid pushed out to the ejection flow path increases and continues to change in the direction of increasing the volume of the first fluid chamber. At a moment, the fluid pushed out into the jet flow path decreases. When the volume of the ejection flow path increases or decreases by the same amount following the momentary increase / decrease (pulsation flow) of the fluid pushed out to the ejection flow path, the fluid ejected from the ejection opening is pulsated. It will not flow. Also, if the volume of the injection channel does not change,
The fluid is ejected in a pulse form from the ejection opening while maintaining the pulsating flow. By adjusting the amount of change in the volume of the injection flow path by the adjusting means, the strength of the pulsating flow to be injected can be adjusted. As a result, the intensity of the pulsating flow to be ejected can be controlled by the operator between the pulsating flow generating portion and the ejection opening without performing electrical control of the volume variation means. Therefore, the surgeon can be freed from the troublesome and time-constrained operation of the control unit installed remotely, and can concentrate on the operation. In addition, since an electric controller for this control is not required and there is no signal line routed around the operator, workability is not deteriorated. In addition, there is no possibility that noise will get on the routed signal line and cause malfunction.

Application Example 2 In the fluid ejection device according to the application example described above, the adjusting unit adjusts the amount of movement of the ejection opening that moves forward and backward in the direction in which the ejection flow path extends following the change in volume of the first fluid chamber. By doing so, the amount of change in the volume of the injection flow path is adjusted.

According to this application example, the volume of the injection flow path is changed by the position of the injection opening being changed in the extending direction of the injection flow path by following the pulsating flow due to the volume change of the first fluid chamber. The strength of the pulsating flow of the fluid to be ejected is reduced. Therefore, the intensity of the pulsating flow to be injected can be adjusted by the adjusting means that changes the amount of change by which the injection opening advances and retracts.

Application Example 3 In the fluid ejection device according to the application example described above, the ejection flow path includes a first ejection pipe that communicates with the first fluid chamber, and one end portion is inserted into the first ejection pipe and communicates therewith. And a second injection pipe that slides in the extending direction of the first injection pipe and has an injection opening at the other end, and the adjusting means is supported by the first injection pipe, An elastic body having a first concavo-convex portion penetrating the side wall of one injection tube, and a second concavo-convex portion meshing with the first concavo-convex portion formed on the side surface of the second injection tube, By pressing the elastic body and increasing / decreasing the gap between the first uneven portion and the second uneven portion,
The moving amount of the second injection pipe that moves forward and backward in the sliding direction of the second injection pipe is adjusted.

According to this application example, the position of the second injection pipe having the injection opening is slid in the extending direction of the first injection pipe following the pulsating flow caused by the volume change of the first fluid chamber. As a result, the volume of the ejection flow path changes, and the strength of the pulsating flow of the fluid to be ejected decreases. Therefore, the intensity of the pulsating flow to be injected can be adjusted by the adjusting means that adjusts the amount of change by which the second injection tube advances and retreats. Moreover, since the intensity of the pulsating flow can be adjusted by an operation such as grasping and pinching the elastic body together with the second injection pipe, the operation becomes easy.

Application Example 4 In the fluid ejection device according to the application example described above, the ejection flow path protrudes in a direction that intersects the extending direction of the ejection pipe, the ejection pipe communicating with the first fluid chamber, and the ejection pipe. And the adjusting means adjusts the amount of change in the volume of the second fluid chamber that changes following the change in the volume of the first fluid chamber. It is characterized by adjusting the amount of change in the volume of.

According to this application example, since the volume of the second fluid chamber communicating with the ejection pipe changes following the pulsating flow caused by the volume change of the first fluid chamber, the strength of the pulsating flow of the ejected fluid is increased. descend. Therefore, the intensity of the pulsating flow to be ejected can be adjusted by the adjusting means that changes the amount of change in the volume of the second fluid chamber.

Application Example 5 In the fluid ejection device according to the application example described above, the ejection flow path communicates with the ejection pipe, the cylinder projects in a direction intersecting the extending direction of the ejection pipe, and the cylinder closer to the ejection pipe A first piston that is installed in order and slides, a second piston, an elastic body sandwiched between the first and second pistons, and a pressing means that presses the second piston in the direction of the injection pipe. The adjusting means presses the pressing means to adjust the amount of change in the volume of the second fluid chamber formed by the cylinder and the first piston.

According to this application example, the amount of change in the volume of the second fluid chamber can be adjusted via the elastic body and the first piston by pressing the second piston. Since the direction in which the surgeon presses is a direction opposite to the direction in which the volume of the second fluid chamber is about to change due to the pulsating flow, the surgeon can easily grasp the sense of adjusting the strength of the pulsating flow.

Application Example 6 In the fluid ejection device according to the application example, one end of the ejection flow path is the first.
The adjustment means adjusts the amount of change in the inner diameter of the tubular body that changes following the change in the volume of the first fluid chamber. Thus, the amount of change in the volume of the injection flow path is adjusted.

According to this application example, the inner diameter of the tubular body constituting the ejection flow path is changed following the pulsating flow caused by the volume change of the first fluid chamber, whereby the volume of the ejection flow path is changed and the ejection is performed. The strength of the pulsating flow of the fluid is reduced. Therefore, the strength of the pulsating flow to be injected can be adjusted by the adjusting means for changing the amount of change in the inner diameter of the tubular body.

Application Example 7 In the fluid ejecting apparatus according to the application example described above, the tubular body has a thin portion that is thinner than the others on at least a part of the side surface thereof, and the adjusting means is the first fluid chamber. The amount of change in the volume of the injection flow path is adjusted by adjusting the amount of deformation of the thin portion that deforms following the change in volume.

According to this application example, the thin portion of the tubular body constituting the injection flow path is deformed by following the pulsating flow due to the volume change of the first fluid chamber, so that the volume of the injection flow path is changed. The strength of the pulsating flow of the fluid is reduced. Therefore, the strength of the pulsating flow to be ejected can be adjusted by the adjusting means for changing the deformation amount of the deformed thin portion.

Application Example 8 In the fluid ejection device according to the application example described above, the ejection flow path includes an outer tube that inserts and slides into the tubular body, and the adjusting means is configured such that the outer tube slides in the extending direction of the tubular body and is thin. The amount of change in the volume of the injection passage is adjusted by adjusting the deformation amount of the thin portion by covering the portion.

According to this application example, the adjusting unit can be configured with a small number of elements, and accordingly, a fluid ejecting apparatus that is more compact, light, and has good operability can be provided.

Application Example 9 A fluid ejecting apparatus according to this application example includes a first fluid chamber, a pulsating flow generator having volume changing means for changing the volume of the first fluid chamber, and the first fluid chamber. , A third fluid chamber communicating with the first fluid chamber, and a change in volume of the third fluid chamber following the change in volume of the first fluid chamber Adjusting means for adjusting the amount.

According to this application example, the volume of the third fluid chamber that communicates with the first fluid chamber changes following the pulsating flow caused by the volume change of the first fluid chamber. The intensity of pulsating flow is reduced. Therefore, the intensity of the pulsating flow to be ejected can be adjusted by the adjusting means that changes the amount of change in the volume of the third fluid chamber.

  Application Example 10 A medical device including the fluid ejecting apparatus described above.

By using the fluid ejection device described above as a medical device, it is possible to provide more effective characteristics as a surgical instrument.

FIG. 3 is a side cross-sectional view illustrating a configuration of the fluid ejection device according to the first embodiment. (A): Side sectional view showing the configuration of the pulsating flow adjusting means according to the first embodiment. (B), (c); Schematic which shows operation | movement of a pulsating flow adjustment means. (A); Side sectional view which shows the structure of the pulsating flow adjustment means which concerns on 2nd Example. (B), (c); Schematic which shows operation | movement of a pulsating flow adjustment means. (A); Side sectional view which shows the structure of the pulsating flow adjustment means which concerns on 3rd Example. (B), (c); Schematic which shows operation | movement of a pulsating flow adjustment means. (D); Perspective view showing the configuration of the pulsating flow adjusting means. (A); Side sectional view of pulsating flow adjusting means according to Modification 1. (B); Side sectional view of pulsating flow adjusting means according to Modification 2. (A); Side sectional schematic of the pulsating flow adjusting means according to Modification 3. (B): Schematic showing the operation of the pulsating flow adjusting means. (C): Perspective view showing the configuration of the pulsating flow adjusting means.

DESCRIPTION OF EXEMPLARY EMBODIMENTS Embodiments of the invention will be described below with reference to the drawings. In the following drawings, the scale of each member is different from the actual scale so that each member can be recognized.

(Embodiment 1)
FIG. 1 is a side cross-sectional view illustrating the configuration of the fluid ejecting apparatus according to the first embodiment. In the present embodiment, a fluid ejecting apparatus suitable for a medical device will be described. However, functions such as excision, incision, separation, and crushing are not limited to use in the medical field.

In FIG. 1, the fluid ejection device 1 includes a fluid supply container 2, a fluid supply pump 10, a pulsating flow generation unit 20, an ejection flow path 70, and the like. The ejection flow path 70 communicates with the pulsating flow generation unit 20. The fluid supply container 2, the fluid supply pump 10, and the pulsating flow generation unit 20 are connected by a tube 4. As a fluid stored in the fluid supply container 2, physiological saline is used as a preferred example.

The pulsating flow generation unit 20 is applicable as long as it is a method capable of converting a fluid into a pulsating flow and ejecting it in a pulsed manner, such as a piezo method using a piezoelectric element or a bubble jet (registered trademark) method. However, the pulsating flow generator exemplified below uses a piezoelectric piezoelectric element.

The pulsating flow generation unit 20 includes a fluid chamber 60 that is a first fluid chamber, a piezoelectric element 30 as a volume changing unit that changes the volume of the fluid chamber 60, an upper plate 35, a diaphragm 40, and a lower case as a casing. 50, an upper case 52, a bottom plate 51, and the like. The pulsating flow generator 20 converts the fluid supplied from the fluid supply pump 10 into a pulsating flow by changing the volume of the fluid chamber 60 by the piezoelectric element 30.

The diaphragm 40 is made of a disk-shaped metal thin plate, and is tightly fixed by a lower case 50 and an upper case 52. The piezoelectric element 30 uses a laminated piezo element as a preferred example,
One of both ends is fixed to the diaphragm 40 via the upper plate 35 and the other is fixed to the bottom plate 51.

The fluid chamber 60 is a space formed by a recess formed on the surface of the upper case 52 facing the diaphragm 40 and the diaphragm 40. A fluid is supplied to the fluid chamber 60 from the fluid supply pump 10 through the tube 4. In addition, an ejection flow path 70 is connected in communication with a substantially central portion of the fluid chamber 60.

The ejection flow path 70 includes an ejection pipe 71 that forms a flow path 72, and includes a pulsating flow adjusting means 80 as an adjusting means. The injection pipe 71 is press-fitted into the upper case 52, and the flow path 72 is communicated with the substantially central portion of the fluid chamber 60. Further, the tip of the injection pipe 71 is provided with an injection opening 73 in which the diameter of the flow path 72 is reduced. In addition, you may comprise the injection opening part 73 with a nozzle. Further, it is desirable that the ejection pipe 71 has such a rigidity that it is not deformed by the fluid pressure during fluid ejection.

The pulsating flow adjusting means 80 has a mechanism for changing the volume of the flow path 72 communicating with the fluid chamber 60 by following the generated pulsating flow, and a mechanism for suppressing and adjusting the change. Pulse current adjusting means 8
0 is placed at the hand of the surgeon. Note that the pulsating flow adjusting means 80 may have a plurality of different structures. Specific structures, operations, and effects thereof will be described later as examples.

Next, the movement of the fluid in the fluid ejecting apparatus 1 configured as described above will be briefly described.
The fluid stored in the fluid supply container 2 is sucked by the fluid supply pump 10 and supplied to the fluid chamber 60 formed in the pulsating flow generation unit 20 through the tube 4 with a constant pressure. By driving the piezoelectric element 30, the volume of the fluid chamber 60 changes via the upper plate 35 and the diaphragm 40, and a pulsating flow is generated in the fluid flowing out to the flow path 72.

Here, means for adjusting the intensity of the pulsating flow will be described.
As described above, the pulsating flow is generated by pulsatingly changing the volume of the fluid chamber 60 with respect to the fluid supplied from the fluid supply pump 10 at a constant pressure. On the other hand, when the volume of the flow path 72 after the outlet of the fluid chamber 60 is changed in the opposite phase to the volume change of the fluid chamber 60, the total of the ejection flow paths including the volume of the fluid chamber 60 is included. The volume will not change,
The pulsating flow cannot be jetted. The pulsating flow adjusting means 80 adjusts the degree of volume change that is changed in the opposite phase.

The volume change amount of the fluid chamber 60 is ΔV1, and the volume change amount of the flow path 72 after the outlet of the fluid chamber 60 is Δ.
Assuming V2, a change amount ΔV3 as a pulsating flow of the fluid ejected from the ejection opening 73 is expressed by the following equation (1).
ΔV3 = − (ΔV1 + ΔV2) (1)
Further, ΔV2 following to ΔV1 is expressed by the following equation (2).
ΔV2 = −kΔV1 (2)
Here, k is a coefficient in the following range.
0 ≦ k ≦ 1 (3)

When ΔV2 is changed by the same amount after being driven to ΔV1, that is, when the amount of decrease in the volume of the fluid chamber 60 is ΔV1 and the amount of increase in the volume of the flow path 72 following is ΔV1, k = 1. Yes,
ΔV3 = − (ΔV1−ΔV1) = 0
Thus, the pulsating flow is not jetted. When k = 0, that is, when the pulsating flow adjusting means 80 is not used,
ΔV3 = −ΔV1
Thus, the pulsating flow is injected as it is.
Therefore, the adjustment by the pulsating flow adjusting means 80 is to change k within the range of (Expression (3)).

When the pulsating flow adjusting means 80 is not used, the fluid that has pulsated due to the volume change of the fluid chamber 60 is jetted at high speed in a pulsed manner from the jetting opening 73 through the flow path 72. When the pulsating flow adjusting means 80 is used, the pulsating flow intensity (pulse intensity) of the fluid jetted at high speed from the ejection opening 73 is adjusted as described above.

When the pulsating flow generation unit 20 stops driving, that is, when the volume of the fluid chamber 60 is not changed, the fluid supplied at a constant pressure from the fluid supply pump 10 is ejected through the fluid chamber 60. Jetted as a continuous flow from the opening 73.

Here, the pulsating flow means a fluid flow in which the fluid flow direction is constant and the fluid flow rate or flow velocity is accompanied by a periodic or irregular change. The pulsating flow includes an intermittent flow in which the flow and stop of the fluid are repeated. However, since the flow rate or flow rate of the fluid only needs to change periodically or irregularly, the pulsating flow is not necessarily an intermittent flow.

Similarly, ejecting fluid in pulses means ejecting fluid in which the flow rate or moving speed of the fluid to be ejected changes periodically or irregularly. An example of pulsed injection is intermittent injection in which fluid injection and non-injection are repeated. However, since the flow rate or moving speed of the fluid to be injected needs to change periodically or irregularly, it is not always intermittent injection. Need not be.

Next, some specific structures of the pulsating flow adjusting means 80 will be described with reference to the drawings as examples.

(First embodiment)
FIG. 2A is a side sectional view showing the configuration of the pulsating flow adjusting means according to the first embodiment. (B),
(C) is the schematic which shows operation | movement of the pulsating flow adjustment means which concerns on 1st Example.
As shown in FIG. 2 (a), the pulsating flow adjusting means 80 includes an injection tube 71 as a first injection tube, an injection tube 101 as a second injection tube, a pulsating flow adjustment arm 102 as an elastic body, and a balance. It consists of a spring 103 and the like.

The injection tube 101 is inserted into the tip of the injection tube 71, and an injection opening 73 is opened at the tip of the injection tube 101. In addition, the injection tube 101 includes a jagged portion 101w as a second concavo-convex portion formed by projecting irregularities in a part of the outer peripheral surface into a thread shape. Injection pipe 10
An opening window 71w through which the jagged portion 101w is exposed is formed at a position corresponding to the jagged portion 101w on the side surface of the injection pipe 71 in which 1 is inserted.

The pulsating flow adjusting arm 102 is a bow-shaped elastic body, and the opening window 71 extends in the extending direction of the injection pipe 71.
It arrange | positions so that w may be straddled, and the both ends are being fixed to the side surface of the injection pipe 71. As shown in FIG. At the substantially central portion of the pulsating flow adjustment arm 102, a knurled portion 102w as a first concavo-convex portion having a shape substantially the same as that of the knurled portion 101w is provided on a surface facing the jagged portion 101w. The jagged portion 101w and the jagged portion 102w are arranged so as to face each other at the opening window 71w.

Next, the adjustment mechanism of the pulsating flow adjusting means 80 will be described with reference to FIGS. FIG.
) And (c) are enlarged views of part A in FIG.

With the both ends of the pulsating flow adjustment arm 102 as fulcrums, the gap amount between the knurl portion 101w and the knurl portion 102w can be changed by the degree to which the central portion of the pulsating flow adjustment arm 102 is pressed.
In a state where the central portion of the pulsating flow adjusting arm 102 is not pressed, as shown in FIG. 2B, the jagged portion 101w and the jagged portion 102 are provided between the jagged portion 101w and the jagged portion 102w.
w There is a gap d that is less than the height of each unevenness h. Further, when the central portion of the pulsating flow adjusting arm 102 is pressed, the jagged portion 101w and the jagged portion 102w can be brought into close contact with each other without a gap as shown in FIG.

In a state where the central portion of the pulsating flow adjustment arm 102 is not pressed, the injection tube 101 can slide in the extending direction of the injection tube 71 inside the injection tube 71. This slide width e is equal to the gap d
It can be adjusted according to the size. In addition, when the central portion of the pulsating flow adjusting arm 102 is pressed and brought into close contact with no gap, the jagged portion 101w and the jagged portion 102w are engaged with each other, and the injection tube 101 slides inside the injection tube 71. Can not be.

Returning to FIG.
The volume of the flow path 72 changes as the ejection pipe 101 slides. The volume of the flow path 72 increases when the ejection pipe 101 is separated from the fluid chamber 60, and decreases when the ejection tube 101 approaches the fluid chamber 60. Therefore, as described above, depending on the degree of pressing the pulsating flow adjustment arm 102,
Since the amount by which the ejection pipe 101 slides changes, the amount of change in the volume of the flow path 72 can be adjusted by the pulsating flow adjustment arm 102. In addition, it is preferable that the position of the pulsating flow adjustment arm 102, that is, the position where the jagged portions 101w and 102w and the opening window 71w are formed is a position that can be easily operated by the operator in the extending direction of the ejection tube 71.

The balance spring 103 is disposed at the tip of the ejection pipe 101 and pushes back the ejection pipe 101 against the pressure in the fluid ejection direction to balance the center position of the reciprocating slide of the ejection pipe 101 caused by the pulsating flow. The tip of the injection pipe 71 is reduced in diameter so that the balance spring 103 does not fall off. The outer periphery of the vicinity of the tip of the injection pipe 101 is reduced in diameter so that a space for accommodating the balance spring 103 is secured and the injection opening 73 is exposed at the tip of the injection pipe 71.

According to the above configuration, when the pulsating flow adjustment arm 102 is not pressed, the volume of the flow path 72 is changed by following the pulsating flow generated by the volume change of the fluid chamber 60, so that the pulse of the fluid to be ejected is changed. The strength of the flow (pulsation) decreases. Or pulsation stops and it becomes a continuous flow. By pressing the pulsating flow adjustment arm 102, the intensity of the pulsating flow to be injected can be adjusted by adjusting the amount of change in the volume of the flow path 72. Specifically, the fluid pushed out to the flow path 72 increases instantaneously as the volume of the fluid chamber 60 decreases instantaneously, and the fluid pushed out to the flow path 72 as the volume of the subsequent fluid chamber 60 increases instantaneously. Decrease. When the volume of the flow path 72 is increased or decreased by the same amount following the momentary increase / decrease (pulsating flow) of the fluid pushed out to the flow path 72, the fluid ejected from the ejection opening 73 is It does not become a pulsating flow. Further, when the volume of the flow path 72 does not change, the fluid is ejected in a pulse form from the ejection opening 73 while maintaining a pulsating flow. Therefore, the pulsating flow (pulse intensity) of the fluid ejected from the ejection opening 73 can be adjusted by limiting the volume change amount of the flow path 72 that changes following the movement.

As described above, according to the fluid ejecting apparatus 1 including the pulsating flow adjusting means 80 of the present embodiment, the following effects can be obtained.
The pulsating flow adjusting means 80 can be installed between the fluid chamber 60 and the ejection opening 73, that is, at the operator's hand. Therefore, the pulsating flow can be controlled by the operator, and the operator can concentrate on the operation by being freed from the troublesome and time constraints of operating the control unit installed remotely.

Further, when the pulsating flow adjusting arm 102 is pressed strongly, the strength of the pulsating flow becomes strong, and when pressed weakly, the strength of the pulsating flow becomes weak, so that the operator can easily adjust sensuously.

In addition, since an electric controller for this control is not required and there is no signal line routed around the operator, workability is not deteriorated. In addition, there is no possibility that noise will get on the routed signal line and cause malfunction.

In addition, the mechanism which adjusts the slide of the injection pipe 71 by the combination of the opening window 71w, the jagged portions 101w and 102w, the pulsating flow adjusting arm 102, and the like can be provided around the axis of the injection pipe 71 or continuously around the axis. It may be configured. In this case, a plurality of or continuously configured pulsating flow adjustment arms 102 can be sandwiched or used.
Further, the injection opening 73 may have a shape protruding from the distal end portion of the injection tube 71 so as to be close to the surgical site.

(Second embodiment)
Next, a second embodiment will be described with reference to the drawings. In addition, about the component same as 1st Example, the same code | symbol is used and the overlapping description is abbreviate | omitted. FIG. 3A is a side sectional view showing the configuration of the pulsating flow adjusting means according to the second embodiment, and FIGS. 3B and 3C are schematic views showing the operation of the pulsating flow adjusting means. The second example is a jet pipe 71 in the fluid jet apparatus 1 of the first embodiment.
And a second fluid chamber projecting in a direction intersecting with the extending direction of the ejection pipe 71, and the second fluid chamber changes in volume by following the pulsating flow caused by the volume change of the fluid chamber 60. In addition, an adjustment means for changing the amount of change in the volume of the second fluid chamber is provided.

As shown in FIG. 3A, the pulsating flow adjusting means 81 of the present embodiment includes an injection tube 71, a tubular body 71r as a cylinder, a nozzle 74, a disc 111a as a first piston, and a second piston. Disk 111b, a pulsating flow adjusting arm 112 as a pressing means, a balance spring 113 as an elastic body, and the like.

A nozzle 74 having an injection opening 73 is fitted and fixed to the tip of the injection pipe 71. The injection pipe 71 includes a tubular body 71r that communicates with the injection pipe 71 and protrudes in a direction intersecting with the extending direction of the injection pipe 71.

The tubular body 71r includes disks 111a and 111b and a balance spring 113 therein. The discs 111a and 111b are discs whose circumferential portions are in sliding contact with the inner circumference of the tubular body 71r, and the balance spring 113 is sandwiched between the opposing surfaces. The disc 111a is
The back surface of the surface in contact with the balance spring 113 is in contact with the fluid filling the flow path 72, and the disc 111b is
The back surface of the surface in contact with the balance spring 113 is connected to the pulsating flow adjusting arm 112 through a connecting rod. The portion surrounded by the inner peripheral surface of the tubular body 71r and the disc 111a and in contact with the flow path 72 is
A fluid chamber 72r as a second fluid chamber is configured.

The diameter of the hole through which the tubular body 71r communicates with the injection tube 71 is smaller than the diameter of the disc 111a so that the disc 111a, the balance spring 113, and the like do not fall into the flow path 72. Also,
The tip of the tubular body 71r is reduced in diameter so as to be smaller than the diameter of the disk 111b so that the disk 111b and the balance spring 113 do not fall off in the protruding direction of the tubular body 71r.

The pulsating flow adjustment arm 112 is a rod-like body, one end is fixed to the outer peripheral surface of the injection tube 71 as a fulcrum, and the substantially central portion is connected to a connecting rod connected to the disc 111b.

Next, the adjusting mechanism of the pulsating flow adjusting means 81 will be described with reference to FIGS. FIG.
) And (c) are enlarged views of the portion B in FIG.

When the pulsating flow adjusting arm 112 is moved in the direction of the arrow shown in FIG. 3A, the disk 111b can be slid (slid) inside the tubular body 71r. First, as shown in FIG. 3B, in a state where the pulsating flow adjustment arm 112 is not pressed, the disk 111a receives the pressure of the fluid in the flow path 72 and the balance spring 113 contracts within the range where the balance spring 113 contracts. Can slide inside. Next, when one end of the pulsating flow adjustment arm 112 is used as a fulcrum and the other end of the pulsating flow adjustment arm 112 is pressed in the direction of the injection pipe 71, as shown in FIG.
The disc 111 b connected to the center of the 12 presses the disc 111 a in the direction of the injection pipe 71 via the balance spring 113. As a result, the disc 111a cannot slide inside the tubular body 71r.

The volume of the fluid chamber 72r changes as the disk 111a slides. As described above, the amount of change in the volume of the fluid chamber 72r can be adjusted by the degree to which the pulsating flow adjusting arm 112 is pressed.

The balance spring 113 presses the disc 111a against the fluid pressure to balance the center position of the reciprocating slide of the disc 111a generated by the pulsating flow.

According to the above configuration, when the pulsating flow adjusting arm 112 is not pressed, the position of the disk 111a is moved to the tubular shape by following the change in the volume of the fluid chamber 60 by the fluid filled in the flow path 72 and the fluid chamber 72r. It moves in the extending direction of the body 71r. That is, the volume of the fluid chamber 72r that communicates with the flow path 72 changes in a direction in which the pulsating flow of the fluid to be ejected is absorbed following the pulsating flow due to the volume change of the fluid chamber 60. Next, when the pulsating flow adjusting arm 112 is pressed, depending on the degree, the fluid chamber 72
The degree of volume change of r differs. Therefore, the intensity of the pulsating flow to be injected can be adjusted. Note that the position of the pulsating flow adjustment arm 112 is preferably a position that can be easily operated by the operator in the extending direction of the ejection tube 71.

As described above, according to the fluid ejecting apparatus 1 including the pulsating flow adjusting means 81 of the present embodiment, the following effects can be obtained in addition to the effects of the above-described embodiments.
Since the direction in which the pulsating flow adjusting arm 112 is pressed and the sliding direction of the disc 111a that changes the volume of the fluid chamber 72r by the pulsating flow are substantially the same, the pulsating flow adjusting arm 112 is easy to press and is more easily adjusted by the operator. That is, since the direction in which the surgeon presses is a direction that opposes the direction in which the volume of the fluid chamber 72r is about to change due to the pulsating flow, the surgeon can easily grasp the sense of adjusting the strength of the pulsating flow. Moreover, since the nozzle 74 is directly inserted and fixed to the tip of the ejection pipe 71, the ejection direction and position of the fluid can be further stabilized.

Note that a plurality of mechanisms including a combination of the tubular body 71r, the disks 111a and 111b, the pulsating flow adjusting arm 112, the balance spring 113, and the like may be configured around the axis of the ejection pipe 71.

(Third embodiment)
Next, a third embodiment will be described with reference to the drawings. In addition, about the component same as 1st Example, the same code | symbol is used and the overlapping description is abbreviate | omitted. 4A is a side sectional view showing the configuration of the pulsating flow adjusting means according to the third embodiment, FIGS. 4B and 4C are schematic views showing the operation of the pulsating flow adjusting means, and FIG. It is a perspective view which shows the structure of a pulsating flow adjustment means. In the third example, in the fluid ejecting apparatus 1 of the first embodiment, a part of the inner diameter of the ejection pipe 71 changes following the volume change of the fluid chamber 60, and the change amount of the inner diameter is changed. It is characterized by comprising adjusting means.

As shown in FIG. 4A, the pulsating flow adjusting means 82 of the present embodiment is an injection pipe 71 as a tubular body.
, A nozzle 74, a pulsating flow adjusting tube 122 as an outer tube, and the like.

A nozzle 74 having an injection opening 73 is fitted and fixed to the tip of the injection pipe 71. Further, the injection pipe 71 is provided with an inner diameter changing region 121 as a thin portion whose side surface is thinner than other portions.

The inner diameter changing region 121 is deformed by receiving the pressure of pulsation due to the volume change of the fluid chamber 60 because the thickness of the side surface constituting the ejection pipe 71 is reduced. Specifically, in the range of the fluid supply pressure by the fluid supply pump 10, the inner diameter of the inner diameter change region 121 does not change, or only slightly changes, and the flow path 72 is reduced by a sharp decrease in the volume of the fluid chamber 60. When the pressure increases (in the case of positive pulsating pressure), the inner diameter change region 121 is deformed in the direction in which the inner diameter increases. In addition, when the pressure of the flow path 72 is lowered due to a steep increase in the volume of the fluid chamber 60 (in the case of a pulsating negative pressure), the deformation returns and returns to the original inner diameter position. The material of the portion constituting the inner diameter change region 121 is not necessarily the same material as that of the injection pipe 71. The inner diameter is deformed in the direction in which the inner diameter is increased by the positive pressure caused by the pulsating flow, and the inner diameter is increased by the negative pressure caused by the pulsating current. What is necessary is just to be comprised with the material and thickness which return. In addition, the portion where the thickness of the side surface of the inner diameter change region 121 is not necessarily limited to a part around the axis of the injection tube 71, and may extend over the entire circumference.

The pulsating flow adjusting tube 122 is a tubular body, and the inner diameter thereof is substantially equal to the outer diameter of the ejection tube 71. The length is equal to or slightly longer than the length of the inner diameter change region 121. Pulse adjustment tube 12
2 can insert the injection pipe 71 in the vicinity of the inner diameter change region 121 and slide it in the extending direction of the injection pipe 71.

Next, the adjustment mechanism of the pulsating flow adjusting means 82 will be described with reference to FIGS. FIG.
) And (c) are enlarged views of a portion C in FIG.

As shown in FIG. 4B, when the pulsating flow adjusting tube 122 does not cover the inner diameter changing region 121,
The inner diameter of the inner diameter change region 121 is expanded by the positive pressure of the pulsating flow, and the deformation is returned to the original inner diameter position by the negative pressure of the pulsating flow. 4C, when the pulsating flow adjusting tube 122 is slid to cover the inner diameter changing region 121, the inner peripheral portion of the pulsating flow adjusting tube 122 has an outer shape of the inner diameter changing region 121. Hold down to enlarge. Therefore, the amount of change in the volume of the flow path 72 can be adjusted by the degree to which the pulsating flow adjusting tube 122 is slid to cover the inner diameter changing region 121.

In order to make the pulsating flow adjusting tube 122 easy to slide, a trigger handle or the like may be provided on the outer peripheral surface of the pulsating flow adjusting tube 122. Further, in the region where the pulsating flow adjusting tube 122 is slid, a thread that engages the inner peripheral portion of the pulsating flow adjusting tube 122 and the outer peripheral portion of the injection tube 71 is engraved, and the pulsating flow adjusting tube 122 is rotated to rotate. The structure to be made may be sufficient. In this case, since it can be slid little by little with a smaller force in the rotation direction, it is easy to make adjustments, and it is possible to prevent inadvertent sliding. Further, the position of the pulsating flow adjusting tube 122, that is, the position of the inner diameter changing region 121 is preferably a position that can be easily operated by the operator in the extending direction of the ejection tube 71.

According to the above configuration, when the inner diameter changing region 121 is not covered, the inner diameter of the inner diameter changing region 121 changes following the volume change of the fluid chamber 60 by the fluid filled in the flow path 72. That is, the volume of the flow path 72 follows the pulsating flow due to the volume change of the fluid chamber 60 and changes in a direction in which the pulsating flow of the ejected fluid is absorbed. Next, when the inner diameter change region 121 is covered, the degree of volume change of the flow path 72 varies depending on the degree. Therefore, the intensity of the pulsating flow to be injected can be adjusted.

As described above, according to the fluid ejecting apparatus 1 including the pulsating flow adjusting means 82 of the present embodiment, the following effects can be obtained in addition to the effects of the above-described embodiments.
The pulsating flow adjusting means 82 can be configured with a small number of components, and accordingly, the fluid ejecting apparatus 1 that is more compact, light, and easy to operate can be provided.

(Medical equipment)
As a medical device, by using the fluid ejecting apparatus 1 described above, it is possible to provide an excellent characteristic as a surgical instrument more effectively. Specifically, the fluid ejecting apparatus 1
Has excellent characteristics as a surgical instrument, such as being free from thermal damage when excising, incising, or crushing a living tissue, and preserving tubule tissue such as blood vessels. In addition, the pulse-like jetting capable of performing an operation with a small amount of physiological saline can ensure good visibility in which the visual field is not obstructed by the fluid or the excised tissue.
The pulsating flow adjusting means 80 to 82 described above are installed in a compact structure at the operator's hand, and can control the pulsating flow to be ejected at the operator's hand. Therefore, the operator is freed from the troublesome and time-constrained operation of the remote control unit, and the operator can concentrate on the operation. Further, no electrical control is required for this control, and no signal line is routed around the operator, so workability is not deteriorated. In addition, there is no possibility that noise will get on the routed signal line and cause malfunction.

Note that the present invention is not limited to the above-described embodiment, and various modifications and improvements can be added to the above-described embodiment. A modification will be described below. In addition, about the component same as embodiment mentioned above, the same code | symbol is used and the overlapping description is abbreviate | omitted.

(Modification 1)
The pulsating flow adjusting means according to Modification 1 will be described below.
FIG. 5A is a side sectional view of the pulsating flow adjusting means 80v according to the first modification. In the first embodiment, as shown in FIG. 2A, the slide range of the injection pipe 101 is adjusted by adjusting the degree of engagement between the jagged portion 101w and the jagged portion 102w by pressing the pulsating flow adjusting arm 102. However, the present invention is not limited to this configuration, and the degree of tightening with screws may be used.

As shown in FIG. 5 (a), the pulsating flow adjusting means 80v is an injection tube 101 as a second injection tube.
v, a pulsating flow adjusting screw 102v, a balance spring 103v, and the like.
The injection tube 101v is threaded at the tip and protrudes from the tip of the injection tube 71.
The pulsating flow adjusting screw 102v fastens the injection pipe 101v to the tip end of the injection pipe 71 via the balance spring 103v. In addition, a stopper 101vst is provided in which a claw protruding from the injection pipe 101v is fitted into a notch carved in the injection pipe 71 so that the injection pipe 101v does not rotate inside the injection pipe 71 when tightening.

When the pulsating flow adjusting screw 102v is firmly tightened, the injection tube 101v does not slide in the extending direction of the injection tube 71. On the other hand, in the case of loose tightening, the injection pipe 101v
Can be slid with a slight gap amount formed between the screw thread and the screw thread of the pulsating flow adjusting screw 102v. Further, the ease of sliding varies depending on the degree of compression of the balance spring 103v. Therefore, the amount of change in the volume of the flow path 72 can be adjusted according to the tightening degree of the pulsating flow adjusting screw 102v, and the intensity of the pulsating flow that is ejected can be adjusted.

According to this modification, the pulsating flow adjusting means can be configured with a simple structure. Further, the pulsating flow adjusting screw 10
If the scale is engraved in 2v, it can be used as an intensity adjustment volume. The pulsating flow adjusting means of the present modification is not a method of adjusting as needed while being used, but is effective when the pulsating flow adjustment strength is preset at hand and used semi-fixed.

(Modification 2)
Next, the pulsating flow adjusting means according to the modified example 2 will be described below.
FIG. 5B is a side sectional view of the pulsating flow adjusting means 81v according to the second modification. In the second embodiment, as shown in FIG. 3A, the slide range of the disc 111a is adjusted by adjusting the pressure by pressing the pulsating flow adjusting arm 112. However, the present invention is not limited to this configuration. The degree of tightening with screws may be used.

As shown in FIG. 5B, the pulsating flow adjusting means 81v includes a tubular body 71rv, a cylinder 111v, a pulsating flow adjusting screw 112v, a balance spring 113v, and the like.
The cylinder 111v is a cylinder having a thread formed on one side. The tubular body 71rv communicates with the injection pipe 71 and protrudes in a direction intersecting with the extending direction of the injection pipe 71. The thread portion of the cylinder 111v is further protruded from the tubular body 71rv, and is fastened to the tubular body 71rv by the pulsating flow adjusting screw 112v via the balance spring 113v. When tightening, the cylinder 11
The cylinder 111v and the tubular body 71rv are provided with a stopper 111vst structure of claw and notch so that 1v does not rotate inside the tubular body 71rv.

When the pulsating flow adjusting screw 112v is firmly tightened, the cylinder 111v does not slide, and when loosely tightened, the cylinder 111v is formed between the thread of the cylinder 111v and the thread of the pulsating flow adjusting screw 112v. A slide with a slight gap is possible. Further, the balance spring 11
The ease of sliding varies depending on the degree of compression of 3v. Therefore, the pulsating flow adjusting screw 112v
The amount of change in the volume of the fluid chamber 72r can be adjusted depending on the degree of tightening, and the strength of the pulsating flow that is ejected can be adjusted.

According to this modification, the pulsating flow adjusting means can be configured with a simple structure. Further, the pulsating flow adjusting screw 11
If the scale is engraved in 2v, it can be used as an intensity adjustment volume. The pulsating flow adjusting means of the present modification is not a method of adjusting as needed while being used, but is effective when the pulsating flow adjustment strength is preset at hand and used semi-fixed.

(Modification 3)
Next, the pulsating flow adjusting means according to the modified example 3 will be described below.
6A is a schematic side sectional view of the pulsating flow adjusting unit 82v according to the third modification, FIG. 6B is a schematic view illustrating the operation of the pulsating flow adjusting unit, and FIG. 6C is a configuration of the pulsating flow adjusting unit. FIG. In the third embodiment, the degree of deformation of the inner diameter changing region 121 has been described as being adjusted by sliding the pulsating flow adjusting tube 122, but it may be configured to be sandwiched instead of being slid.

As shown in FIG. 6A, the pulsating flow adjusting means 82v includes an inner diameter changing region 121v, a pulsating flow adjusting cylinder 122v, and the like.
An inner diameter changing region 121v (FIG. 6B) formed in the injection pipe 71 is replaced with a pulsating flow adjusting cylinder 122v.
(FIG. 6 (c)), the structure is sandwiched from the periphery. The pulsating flow adjusting cylinder 122v is
Two semi-cylinders having substantially the same curvature as that of the side surface of the injection pipe 71 are connected to each other by a connecting plate 122c or the like.

The amount of change in the volume of the flow path 72 can be adjusted by the degree to which the inner diameter change region 121v is sandwiched and pressed.

According to this modification, the surgeon can easily adjust the pulsating flow by adjusting the degree to which the surgeon grasps the pulsating flow adjusting cylinder 122v and sandwiches the ejection tube 71, so that the operator can easily grasp the sense of adjusting the strength of the pulsating flow.

(Modification 4)
Next, the pulsating flow adjusting means according to the modified example 3 will be described below.
In the first embodiment, the second embodiment, the third embodiment, the second modification, and the third modification, the pulsating flow adjusting means 8 is used.
Although 0, 81, 82, 81v, and 82v are described as being provided in the injection pipe 71 constituting the injection flow path 70, the present invention is not limited to this, and the third fluid chamber having no opening is a fluid chamber. 60
The third fluid chamber may be provided with pulsating flow adjusting means. For example, as a third fluid chamber, apart from the injection tube 71, a cylindrical tube having no opening is press-fitted into the upper case 52 to communicate with the fluid chamber 60, and the pulsating flow adjusting means 80, 81, 82, 81v, 82
A pulsating flow adjusting means similar to v may be configured.

According to the present modification, the volume of the third fluid chamber communicating with the fluid chamber 60 changes following the pulsating flow caused by the volume change of the fluid chamber 60, so the strength of the pulsating flow of the fluid flowing through the ejection flow path Decreases.
Therefore, the intensity of the pulsating flow to be ejected can be adjusted by the adjusting means that changes the amount of change in the volume of the third fluid chamber. When the surgeon grasps and uses the pulsating flow generation unit 20, the intensity of the pulsating flow can be adjusted by the operator.

DESCRIPTION OF SYMBOLS 1 ... Fluid injection apparatus, 20 ... Pulsating flow generation part, 60 ... Fluid chamber, 70 ... Injection flow path, 71,101
... Injection pipe, 72... Flow path, 73... Injection opening, 80.

Claims (6)

A pulsating flow generating section that includes a first fluid chamber and imparts a pulsating flow to the fluid in the first fluid chamber;
An ejection flow path communicating with the first fluid chamber and having an ejection opening;
Adjusting means for adjusting the amount of change in the volume of the ejection flow path; and
The fluid ejecting apparatus according to claim 1, wherein the adjusting unit is disposed between the pulsating flow generation unit and the ejection opening. The injection flow path is
A first injection pipe communicating with the first fluid chamber;
A second injection pipe having one end inserted into and communicated with the first injection pipe, sliding in the extending direction of the first injection pipe, and having an injection opening at the other end; Including
The adjusting means includes
An elastic body supported by the first injection pipe and having a first concavo-convex portion penetrating a side wall of the first injection pipe;
A second concavo-convex portion meshing with the first concavo-convex portion formed on a side surface of the second injection pipe,
By pressing the elastic body to increase / decrease the gap between the first concavo-convex part and the second concavo-convex part, the second injection pipe moves forward and backward in the sliding direction of the second injection pipe. The fluid ejecting apparatus according to claim 1, wherein an amount of change in the volume of the ejection flow path is adjusted by adjusting a movement amount. The injection flow path is
An injection pipe communicating with the first fluid chamber;
A second fluid chamber communicating with the ejection pipe and projecting in a direction intersecting with the extending direction of the ejection pipe ;
A cylinder that communicates with the injection pipe and protrudes in a direction intersecting the extending direction of the injection pipe;
A first piston and a second piston which are installed in the cylinder in order from the side closer to the injection pipe and slide;
An elastic body sandwiched between the first and second pistons;
Pressing means for pressing the second piston in the direction of the injection pipe,
The adjusting means includes
Adjusting the amount of change in the volume of the ejection flow path by adjusting the amount of change in the volume of the second fluid chamber formed by the cylinder and the first piston by pressing the pressing means. The fluid ejecting apparatus according to claim 1. The ejection flow path is formed of a tubular body having one end communicating with the first fluid chamber and the other end having an ejection opening, and the tubular body is formed at least on a part of the side surface thereof than the other. It has a thin part with a thin thickness,
The adjusting means, by adjusting the amount of change in the inner diameter of the front Symbol tubular body, fluid ejection device of claim 1, characterized in that adjusting the amount of change in volume of the injection passage. The ejection flow path includes an outer tube that inserts and slides into the tubular body,
The adjusting means adjusts the amount of change in the volume of the injection flow path by adjusting the amount of deformation of the thin portion by sliding the outer tube in the extending direction of the tubular body and covering the thin portion. The fluid ejecting apparatus according to claim 4.   A medical device using the fluid ejection device according to any one of claims 1 to 5.

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